is a type of computer security vulnerability typically found in web applications that enables malicious attackers to inject client-side script into web pages viewed by other users.

is an attempt to make a computer resource unavailable to its intended users by sending invalid/forged requests

is a form of attack on a database-driven Web site in which the attacker executes unauthorized SQL commands by taking advantage of insecure code on a system connected to the Internet

is a type of malicious exploit of a website whereby unauthorized commands are transmitted from a user that the website trusts